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i knew someone with an audi s5 who had this done.
it was crazy loud with alot of drone, and it was very obvious the sound was coming out from under the car, like right where the front windows were.
FYI the new shelby mustang has a cutout and has side exhaust (where the cutouts lead) and a normal tailpipe outlet at the back.
they showed the whole car on its side and you could see the valves.
personally i think its too loud as it is right next to your window
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